6665617 has 6 divisors (see below), whose sum is σ = 7753938. Its totient is φ = 5713344.

The previous prime is 6665611. The next prime is 6665623. The reversal of 6665617 is 7165666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6665611) and next prime (6665623).

It can be written as a sum of positive squares in only one way, i.e., 3651921 + 3013696 = 1911^2 + 1736^2 .

It is not a de Polignac number, because 6665617 - 2¹⁵ = 6632849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6665611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67968 + ... + 68065.

It is an arithmetic number, because the mean of its divisors is an integer number (1292323).

Almost surely, 2^6665617 is an apocalyptic number.

It is an amenable number.

6665617 is a deficient number, since it is larger than the sum of its proper divisors (1088321).

6665617 is a wasteful number, since it uses less digits than its factorization.

6665617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136047 (or 136040 counting only the distinct ones).

The product of its digits is 45360, while the sum is 37.

The square root of 6665617 is about 2581.7856223939. The cubic root of 6665617 is about 188.1973275162.

The spelling of 6665617 in words is "six million, six hundred sixty-five thousand, six hundred seventeen".